Asteroids with Satellites Database--Johnston's Archive

(136108) Haumea, Hi'iaka, and Namaka

compiled by Wm. Robert Johnston
last updated 10 May 2014
under construction--testing upgrades!

--Orbital and physical data--

(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)

dynamical type, primary: TNO, Haumea family


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 43.1660 AU
orbital period P: 283.610 yr (= 103588.5 d)
eccentricity e: 0.192457
perihelion distance q: 34.8584 AU
aphelion distance Q: 51.4736 AU
inclination i: 28.191350°
argument of perihelion ω: 240.4148°
ascending node Ω: 121.78801°
mean anomaly M: 208.1445°
perihelion passage TP: 2134 Jan 09
Epoch: 2014 May 23
data arc: 1955-2014 (1104 obs.)
Earth MOID: 33.9436 AU
Jupiter Tisserand invariant TJ: 5.103
Neptune Tisserand invariant TN:2.77 [*D]


orbital data, Hi'iaka:
semimajor axis as: 49880 ± 198 km [R09a]
separation/primary radius as/rp:72 [*D]
separation/Hill radius as/rH:0.011 [*D]
orbital period Ps: 49.462 ± 0.083 d [R09a]
eccentricity es: 0.0513 ± 0.0078 [R09a]
inclination is:126.356°± 0.064 [R09a]
ascending node Ωs:206.766°± 0.033 [R09a]
argument of pericenter ωs:154.1°± 5.8 [R09a]
mean anomaly M:152.8°± 6.1 [R09a]
normalized ang. mom. αL: ?


orbital data, Namaka:
semimajor axis as: 25657 ± 91 km [R09a]
separation/primary radius as/rp:37 [*D]
separation/Hill radius as/rH:0.0056 [*D]
orbital period Ps: 18.2783 ± 0.0076 d [R09a]
eccentricity es: 0.249 ± 0.015 [R09a]
inclination is:113.013°± 0.075 [R09a]
ascending node Ωs:205.016°± 0.228 [R09a]
argument of pericenter ωs:178.9°± 2.3 [R09a]
mean anomaly M:178.5°± 1.7 [R09a]
normalized ang. mom. αL: ?

other data, system (combined):
absolute mag. H: 0.1 [MPC]
0.444 ± 0.021 [R06a]
slope parameter G: 0.15 [*A]
effective diameter dE: 1425 km [*D]
geometric albedo: 0.663 ± 0.063/0.063 [R06a]
color index U-B: 0.11 [J07a]
color index B-V: 0.626 [R06a]
color index V-R:0.343± 0.02 [R06a]
color index B-R:0.972± 0.014 [L08a]
color index V-I:0.683± 0.02 [R06a]
color index R-J:0.885± 0.012 [L08a]
color index J-H:-0.057± 0.016 [L08a]
taxonomic type: ?
mass m: 4.03x1021 ± 4x1019 kg [R09a]
density ρ: 2.97 ± 0.37/0.37 g/cm3 [R06a]
Hill radius rH: 4600000 km [*D]

other data, primary:
diameter dp: 1379 ± 57/57 km [R06a]
dimensions :1960x1518x996km [R06a]
color index J-H:-0.057± 0.016 [L08a]
rotation period RPp: 3.9154 ± 0.0002 h [R06a]
amplitude in mag., rotational ΔM: 0.30 ± 0.02 [R06a]
pole direction : ? ; ?


other data, Hi'iaka:
diameter ds: 320 km [R09a]
diameter ratio ds/dp: 0.232 [*D]
component mag. difference ΔM: 2.98 ± 0.03 [*L08a]
geometric albedo :0.8± 0.07[]
color index J-H:-0.399± 0.034 [L08a]
rotation period RPs: ?


other data, Namaka:
diameter ds: 160 km [R09a]
diameter ratio ds/dp: 0.116 [*D]
component mag. difference ΔM: 4.6 [*D]
geometric albedo :0.8± 0.2[]
rotation period RPs: ?

-- (136108) Haumea, Hi'iaka, and Namaka --discovery and notes:

Primary discovered 2003 Mar 07 from Sierra Nevada Observatory, Granada, Spain by ?. Alternate designation(s): 2003 EL61 . Linked to prediscovery observations from 1955 Mar 22. Permanent number assigned 2006 Sep 07.

Named 2008 Sep 17 for the mythological Hawaiian goddess of childbirth and fertility [MPC63878].

Hi'iaka discovered 2005 Jan 26 by M. E. Brown, et al. using AOT observations from W. M. Keck II Telescope, Mauna Kea, Hawaii, USA. Announced 2005 Jul 29 [I8577]. Provisional designation S/2005 (2003 EL61) 1. Permanent designation I Hi'iaka, assigned 2008 Sep 17; named for the mythological Hawaiian goddess [I8976].

Namaka discovered 2005 Jun 30 by M. E. Brown, et al. using AOT observations from W. M. Keck II Telescope, Mauna Kea, Hawaii, USA. Announced 2005 Dec 01 [I8636]. Provisional designation S/2005 (2003 EL61) 2. Permanent designation II Namaka, assigned 2008 Sep 17; named for the Hawaiian mythological water spirit [I8976].

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2005-2009, 2014 by Wm. Robert Johnston.
Last modified 10 May 2014.
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